• There is no universal gene expression signature for senescent cells or the SASP. Primary and secondary seem to be distinct from each other in some respects. Secondary senescence can spread via secreted molecules, extracellular vesicles, cell-to-cell contact. contributes accumulation of associated with diseases aging. Cellular a state stable cell cycle arrest that known elicited response diffe...

Abstract Although it is well established that nitrogen (N) deficiency induces leaf senescence, the molecular mechanism of N deficiency-induced senescence remains largely unknown. Here, we show an abscisic acid (ABA)-responsive NAC transcription factor (TF) involved in senescence. The overexpression MdNAC4 led to increased ABA levels apple calli by directly activating biosynthesis gene MdNCED2 ....

Leaf senescence is an intrinsic biological process of plants. The phytohormones salicylic acid (SA) and ethylene (ET) are known to promote senescence. However, their relationship in this still unclear. We found that EIN3 EIL1, two key transcription factors ET signaling, required for SA-induced leaf Arabidopsis. Furthermore, enhances the effect SA promoting Biochemical studies revealed NPR1, mas...

Abstract Salicylic acid (SA) is an important plant hormone that regulates defense responses and leaf senescence. It imperative to understand upstream factors regulate genes of SA biosynthesis. SAG202/SARD1 a key regulator for isochorismate synthase 1 ( ICS1 ) induction biosynthesis in responses. The regulatory mechanism during senescence not well understood. Here we show AtNAP, senescence-speci...

Senescence is an integral part of the normal developmental cycle of plants and can be traced in cell, tissue and organ level. This work was focused on the efficiency of post-harvest treatment with the free polyamine spermine (Spm) to extend the vase life of cut rose flowers as an anti-senescence compound. Spm treatment was applied at the rates of 0, 1, 2 and 4 mM. Some morphological, biochemica...

Concentrations of NO2 and O3 were measured inside and outside a dense broad-leaved forest canopy adjacent to a busy traffic route in the City of Gothenburg, Sweden, with duplicate passive diffusion samplers during six one-week periods starting well before leaf senescence and ending when leaves were largely senescent. Concentrations of NO2 were lower inside the forest canopy during all periods (...

Light regulates leaf senescence and light deprivation causes large-scale transcriptional reprogramming to dismantle cellular components and remobilize nutrients to sink organs, such as seeds and storage tissue. We recently reported that in Arabidopsis (Arabidopsis thaliana), Phytochrome-Interacting Factor4 (PIF4) and PIF5 promote dark-induced senescence and natural senescence by directly activa...

As a stress response, senescence is a dynamic process involving multiple effector mechanisms whose combination determines the phenotypic quality. Here we identify autophagy as a new effector mechanism of senescence. Autophagy is activated during senescence and its activation is correlated with negative feedback in the PI3K-mammalian target of rapamycin (mTOR) pathway. A subset of autophagy-rela...

Abstract Leaf senescence, the last stage of leaf development, is a type postmitotic senescence and characterized by functional transition from nutrient assimilation to remobilization which essential for plants’ fitness. The initiation progression are regulated variety internal external factors such as age, phytohormones, environmental stresses. Significant breakthroughs in dissecting molecular ...